Saw-bit holder



(No Model.)

H. 'GHASE.

SAW BIT HOLDER.

N0. 455,169. Patented June 30,1891.'

UNITED STATES PATENT OFFICE.

STEPHEN H. CHASE, OF SAN JOSE, CALIFORNIA.

SAW-BIT HOLDER.

SPECIFICATION forming part of Letters Patent No. 455,169, dated June 30,1891. Application filed August 20,1890- Serial No. 362.550. (No model)To all whom it may concern:

Be it known that I, STEPHEN H. CHASE, a citizen of the United States,residing at San J os, Santa Clara county, State of California, haveinvented an Improvement in Saw-Bit Holders; and I hereby declare thefollowing to be a full, clear, and exact description of the same.

My invention relates to certain improvements in saw-bit and holders; andit consists in certain details of construction which will be more fullyexplained by reference to the accompanying drawings, in which- Figure 1is a view of a portion of a sawplate, showing two teeth with theirinserted bits and the holders by which they are retained in place. Fig.2 is an .edge View of the saw-plate.-

A is a saw-plate having the teeth B and the throats or spaces betweenthe teeth for the escape of the sawdust in the usual manner.

O are the bits or cutters, which in the present case I have shown withstraight backs having V-shaped grooves or channels formed in them to fitthe corresponding V-shaped beveled tongues which extend along the frontedges of the teeth The lower ends 0 of these bits extend down somedistance below the throat and into sockets in the saw-plate, so that thewhole lower end fits into a correspondingly-shaped opening or socket, asshown at D. Above this socket the front of the saw-bit is made concaveto receive and engage the holder.

The lock or holder consists of a semicircular or segmental piece havingthe head or portion E adapted to turn in a correspondinglyshaped groovein the side or bottom of'the throat opposite to the bit. The other endis formed in a segment of a circle having the center of its curvaturecorresponding with that of the head E, and the front of the sawbit ismade concave, and is formed in the same curve with this end and has theusual V-shaped central tongue, which fits into a correspondingly-shapedgroove or channel formed in the outer curved end of the holder. Thisholder, as shown, is semicircular in shape, and its front or inner curveforms a continuation of the throat of the bit and the saw-plate, so asto provide a free escape for the sawdust.

The central portion of the holder is made narrow enough so as to havesome elasticity, so that the ends of the semicircle pressoutwardly, andthus serve to hold the bit firmly in place. The outer curve of theholder, which fits into the concaved portion of the bit-holderto lock itin place, is extended downward and forward, as shown at G, and thisportion or extension fits into the socket formed in the plate A and justin front of the socket which holds the extension of the bit, and thussteadies and maintains the bitholder firmlyin place. By thus extendingthe lower end of the bit below the concave front or look and forming thesockets for the extension of the bit and the holder they are more firmlylocked in the plate, prevented from being displaced by sudden strains,and the saw plates and parts may be made much thinner.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A saw-bit having its rear edge formed to connect with the front of asaw-tooth with a tongue-and-groove joint, a segmental con cavity in thefront similarly fitted to a correspondingly-shaped holder, an extensionbe low the concave portion adapted to fit into a correspondingly-shapedsocket in the sawplate, and a socket in the plate in front of saidextension adapted to receive a projection from the holder, substantiallyas herein described.

2. The saw-plate and the bit or cutter having an extension fitting asocket in the plate, in combination with a curved holder having headsfitting sockets in the plate-bit, said holder being elastic at itscenter and having a forward extension from one end fitting acorresponding socket in the saw-plate just in front of the extension ofthe bit, substantially as herein described.

In witness whereof I have hereunto set my hand.

STEPHEN H. CHASE.

Witnesses:

S. H. DUEY, FRED BROWN.

